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ヨネハラ アツノリ
YONEHARA ATSUNORI
米原 厚憲 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2001/04 |
| 形態種別 | その他 |
| 標題 | ASCA observation of the lensed blazar PKS 1830-211: An implication of X-ray microlensing |
| 執筆形態 | その他 |
| 掲載誌名 | ASTROPHYSICAL JOURNAL |
| 出版社・発行元 | UNIV CHICAGO PRESS |
| 巻・号・頁 | 551(2),pp.929-933 |
| 著者・共著者 | T Oshima,K Mitsuda,N Ota,A Yonehara,M Hattori,T Mihara,Y Sekimoto |
| 概要 | We present ASCA observations of the gravitationally lensed blazar PKS 1830-211. Intensity variations of about 10% and spectral variations were detected in the eight observations made at intervals of about 5 days. The spectral variations can be described by a change of absorption column density if we represent the spectrum with a single power-law model. However, it is more likely that the spectrum consists of two spectral components with different absorptions and that their intensity ratio varies. The column densities of the two components are consistent with the column densities of the two lensed images. However, the intensity ratio is different by a factor of 7.4 from the magnification ratio of the two lensed images. We suggest that the discrepancy is most likely due to X-ray microlensing, among several other possibilities. We estimate that the size of the X-ray emission region must be smaller than similar to3 x 10(14) cm in order to explain the observed microlensing magnification. |
| DOI | 10.1086/320246 |
| ISSN | 0004-637X/1538-4357 |